My other kit was purchased in 06 & is still running strong, believe it or not it was the cheap xentec kits on ebay after a week one of the bulbs started to flicker during initial start up so I emailed the seller & they sent me a brand new pair of bulbs no questions asked & i didn't have to send in the old bulbs. So if you just want to try it out I would recommend xentec. Mainly for the quick returns in warranty.
That was the kit I provided a link for unfortunately it was removed (guess I should go back and read posting rules again).
I think the fog lamp kits would probably me more flexible in designing presentation for the lights and enclosures.
Also I revived this to see if anyone has heard of or seen results for freshwater planted tanks. Plus if anyone has any more technical specs as far as the PAR and spectrum values are concerned for the HID lamps.